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data-v-531573d4><p class="link-text" data-v-531573d4>事件监听</p></a><a class="link" href="/js/23.html" data-v-59eaa146 data-v-531573d4><p class="link-text" data-v-531573d4>事件对象与鼠标事件</p></a><a class="link" href="/js/24.html" data-v-59eaa146 data-v-531573d4><p class="link-text" data-v-531573d4>键盘事件</p></a><a class="link" href="/js/25.html" data-v-59eaa146 data-v-531573d4><p class="link-text" data-v-531573d4>进度事件和表单事件</p></a><a class="link" href="/js/26.html" data-v-59eaa146 data-v-531573d4><p class="link-text" data-v-531573d4>触摸事件和其他常见事件</p></a><a class="link" href="/js/27.html" data-v-59eaa146 data-v-531573d4><p class="link-text" data-v-531573d4>三大家族scroll、offset、client</p></a><a class="link" href="/js/28.html" data-v-59eaa146 data-v-531573d4><p class="link-text" data-v-531573d4>事件传播</p></a><a class="link" href="/js/29.html" data-v-59eaa146 data-v-531573d4><p class="link-text" data-v-531573d4>定时器和延时器</p></a><a class="link" href="/js/30.html" data-v-59eaa146 data-v-531573d4><p class="link-text" data-v-531573d4>BOM是什么</p></a><a class="link" href="/js/31.html" data-v-59eaa146 data-v-531573d4><p class="link-text" data-v-531573d4>window 对象</p></a><a class="link" href="/js/32.html" data-v-59eaa146 data-v-531573d4><p class="link-text" data-v-531573d4>Navigator 对象和Screen 对象</p></a><a class="link" href="/js/33.html" data-v-59eaa146 data-v-531573d4><p class="link-text" data-v-531573d4>History对象和Location对象</p></a><a class="link" href="/js/34.html" data-v-59eaa146 data-v-531573d4><p class="link-text" data-v-531573d4>表单和FormData 对象</p></a><a class="link" href="/js/35.html" data-v-59eaa146 data-v-531573d4><p class="link-text" data-v-531573d4>Storage接口</p></a><a class="link" href="/js/36.html" data-v-59eaa146 data-v-531573d4><p class="link-text" data-v-531573d4>节流和防抖</p></a><!--]--></section></div><!--]--><!--[--><!--]--></nav></aside><div id="VPContent" class="VPContent has-sidebar" data-v-23306c50 data-v-790151bc><div class="VPContentDoc has-aside has-sidebar" data-v-790151bc data-v-4fe9b7bd><div class="container" data-v-4fe9b7bd><div class="aside" data-v-4fe9b7bd><div class="aside-container" data-v-4fe9b7bd><!--[--><!--]--><div class="VPContentDocOutline" data-v-4fe9b7bd data-v-aa0e2252><div class="outline-marker" data-v-aa0e2252></div><div class="outline-title" data-v-aa0e2252>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-aa0e2252><span id="doc-outline-aria-label" class="visually-hidden" data-v-aa0e2252>Table of Contents for current page</span><ul class="root" data-v-aa0e2252><!--[--><li style="" data-v-aa0e2252><a class="outline-link" href="#_1-基本介绍" data-v-aa0e2252>1.基本介绍</a><!----></li><li style="" data-v-aa0e2252><a class="outline-link" href="#_2-if-条件分支语句" data-v-aa0e2252>2.if(条件分支语句)</a><!----></li><li style="" data-v-aa0e2252><a class="outline-link" href="#_3-switch-条件分支语句" data-v-aa0e2252>3.switch(条件分支语句)</a><!----></li><li style="" data-v-aa0e2252><a class="outline-link" href="#_4-while-循环语句" data-v-aa0e2252>4.while 循环语句</a><!----></li><li style="" data-v-aa0e2252><a class="outline-link" href="#_5-for-循环语句" data-v-aa0e2252>5.for 循环语句</a><!----></li><li style="" data-v-aa0e2252><a class="outline-link" href="#_6-break-和-continue" data-v-aa0e2252>6.break 和 continue</a><!----></li><li style="" data-v-aa0e2252><a class="outline-link" href="#_7-label-表达式" data-v-aa0e2252>7.label 表达式</a><!----></li><li style="" data-v-aa0e2252><a class="outline-link" href="#_8-初识算法" data-v-aa0e2252>8.初识算法</a><!----></li><!--]--></ul></nav></div><!--[--><!--[--><!--[--><div><a class="sponsors-aside-text" href="/">联系客服</a><img src="/images/qrcode.png"></div><!--]--><!--]--><!--]--><div class="VPCarbonAds" data-v-4fe9b7bd><img src="/logo.svg" alt="" srcset=""></div><!--[--><!--[--><!--[--><h1 class="tagline" data-v-3916b2f0><span class="accent" data-v-3916b2f0>Bin</span><br data-v-3916b2f0>QQ - 1974892005 </h1><!--]--><!--]--><!--]--></div></div><div class="content" data-v-4fe9b7bd><!--[--><!--]--><main data-v-4fe9b7bd><div style="position:relative;" class="vt-doc js" data-v-4fe9b7bd><div><h1 id="_03-【流程控制语句】" tabindex="-1">03 【流程控制语句】 <a class="header-anchor" href="#_03-【流程控制语句】" aria-hidden="true">#</a></h1><h2 id="_1-基本介绍" tabindex="-1">1.基本介绍 <a class="header-anchor" href="#_1-基本介绍" aria-hidden="true">#</a></h2><div class="language-js line-numbers-mode"><pre><code><span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">*</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">*</span><span style="color:#A6ACCD;"> 流程控制语句</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">*</span><span style="color:#A6ACCD;"> 	</span><span style="color:#89DDFF;">-</span><span style="color:#A6ACCD;"> JS中的程序是从上到下一行一行执行的</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">*</span><span style="color:#A6ACCD;"> 	</span><span style="color:#89DDFF;">-</span><span style="color:#A6ACCD;"> 通过流程控制语句可以控制程序执行流程，</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">*</span><span style="color:#A6ACCD;"> 		使程序可以根据一定的条件来选择执行</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">*</span><span style="color:#A6ACCD;">  </span><span style="color:#89DDFF;">-</span><span style="color:#A6ACCD;"> 语句的分类：</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">*</span><span style="color:#A6ACCD;"> 		1</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">条件判断语句</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">*</span><span style="color:#A6ACCD;"> 		2</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">条件分支语句</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">*</span><span style="color:#A6ACCD;"> 		3</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">循环语句			</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">*</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br></div></div><div class="language-js line-numbers-mode"><pre><code><span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">*</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">*</span><span style="color:#A6ACCD;"> </span><span style="color:#82AAFF;">prompt</span><span style="color:#A6ACCD;">()可以弹出一个提示框，该提示框中会带有一个文本框，</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">*</span><span style="color:#A6ACCD;"> 	用户可以在文本框中输入一段内容，该函数需要一个字符串作为参数，该字符串将会作为提示框的提示文字</span></span>
<span class="line"></span>
<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">*</span><span style="color:#A6ACCD;"> 用户输入的内容将会作为函数的返回值返回，可以定义一个变量来接收该内容</span><span style="color:#89DDFF;">,</span><span style="color:#82AAFF;">prompt</span><span style="color:#A6ACCD;">()函数的返回值是String类型的</span></span>
<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">*</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">//score就是小明的期末成绩</span></span>
<span class="line"><span style="color:#C792EA;">var</span><span style="color:#A6ACCD;"> score </span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;"> </span><span style="color:#82AAFF;">prompt</span><span style="color:#A6ACCD;">(</span><span style="color:#89DDFF;">&quot;</span><span style="color:#C3E88D;">请输入小明的期末成绩(0-100):</span><span style="color:#89DDFF;">&quot;</span><span style="color:#A6ACCD;">)</span><span style="color:#89DDFF;">;</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br></div></div><h2 id="_2-if-条件分支语句" tabindex="-1">2.if(条件分支语句) <a class="header-anchor" href="#_2-if-条件分支语句" aria-hidden="true">#</a></h2><p>条件判断语句也称为if语句<br> 语法一：</p><div class="language-javascript line-numbers-mode"><pre><code><span class="line"><span style="color:#89DDFF;font-style:italic;">if</span><span style="color:#A6ACCD;">(条件表达式)</span><span style="color:#89DDFF;">{</span><span style="color:#F07178;">  </span></span>
<span class="line"><span style="color:#F07178;">   </span><span style="color:#A6ACCD;">语句</span><span style="color:#89DDFF;">...</span><span style="color:#F07178;">  </span></span>
<span class="line"><span style="color:#89DDFF;">}</span><span style="color:#A6ACCD;">  </span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><div class="language-js line-numbers-mode"><pre><code><span class="line"><span style="color:#A6ACCD;"> 执行流程：  </span></span>
<span class="line"><span style="color:#A6ACCD;"> if语句执行时，会先对条件表达式进行求值判断，  </span></span>
<span class="line"><span style="color:#A6ACCD;"> 如果值为true，则执行if后的语句  </span></span>
<span class="line"><span style="color:#A6ACCD;"> 如果值为false，则不执行  </span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><p>语法二：</p><div class="language-javascript line-numbers-mode"><pre><code><span class="line"><span style="color:#89DDFF;font-style:italic;">if</span><span style="color:#A6ACCD;">(条件表达式)</span><span style="color:#89DDFF;">{</span><span style="color:#F07178;">  </span></span>
<span class="line"><span style="color:#F07178;">	</span><span style="color:#A6ACCD;">语句</span><span style="color:#89DDFF;">...</span><span style="color:#F07178;">  </span></span>
<span class="line"><span style="color:#89DDFF;">}</span><span style="color:#89DDFF;font-style:italic;">else</span><span style="color:#89DDFF;">{</span><span style="color:#F07178;">  </span></span>
<span class="line"><span style="color:#F07178;">	</span><span style="color:#A6ACCD;">语句</span><span style="color:#89DDFF;">...</span><span style="color:#F07178;">  </span></span>
<span class="line"><span style="color:#89DDFF;">}</span><span style="color:#A6ACCD;"> </span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><div class="language-js line-numbers-mode"><pre><code><span class="line"><span style="color:#A6ACCD;"> 执行流程：  </span></span>
<span class="line"><span style="color:#A6ACCD;">	</span><span style="color:#89DDFF;font-style:italic;">if</span><span style="color:#89DDFF;">...</span><span style="color:#A6ACCD;">else语句执行时，会对条件表达式进行求值判断，  </span></span>
<span class="line"><span style="color:#A6ACCD;">		如果值为true，则执行if后的语句  </span></span>
<span class="line"><span style="color:#A6ACCD;">		如果值为false，则执行else后的语句  </span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><p>语法三：</p><div class="language-javascript line-numbers-mode"><pre><code><span class="line"><span style="color:#89DDFF;font-style:italic;">if</span><span style="color:#A6ACCD;">(条件表达式)</span><span style="color:#89DDFF;">{</span><span style="color:#F07178;">  </span></span>
<span class="line"><span style="color:#F07178;">	</span><span style="color:#A6ACCD;">语句</span><span style="color:#89DDFF;">...</span><span style="color:#F07178;">  </span></span>
<span class="line"><span style="color:#89DDFF;">}</span><span style="color:#89DDFF;font-style:italic;">else</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;font-style:italic;">if</span><span style="color:#A6ACCD;">(条件表达式)</span><span style="color:#89DDFF;">{</span><span style="color:#F07178;">  </span></span>
<span class="line"><span style="color:#F07178;">	</span><span style="color:#A6ACCD;">语句</span><span style="color:#89DDFF;">...</span><span style="color:#F07178;">  </span></span>
<span class="line"><span style="color:#89DDFF;">}</span><span style="color:#89DDFF;font-style:italic;">else</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;font-style:italic;">if</span><span style="color:#A6ACCD;">(条件表达式)</span><span style="color:#89DDFF;">{</span><span style="color:#F07178;">  </span></span>
<span class="line"><span style="color:#F07178;">	</span><span style="color:#A6ACCD;">语句</span><span style="color:#89DDFF;">...</span><span style="color:#F07178;">  </span></span>
<span class="line"><span style="color:#89DDFF;">}</span><span style="color:#89DDFF;font-style:italic;">else</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;font-style:italic;">if</span><span style="color:#A6ACCD;">(条件表达式)</span><span style="color:#89DDFF;">{</span><span style="color:#F07178;">  </span></span>
<span class="line"><span style="color:#F07178;">	</span><span style="color:#A6ACCD;">语句</span><span style="color:#89DDFF;">...</span><span style="color:#F07178;">  </span></span>
<span class="line"><span style="color:#89DDFF;">}</span><span style="color:#89DDFF;font-style:italic;">else</span><span style="color:#89DDFF;">{</span><span style="color:#F07178;">  </span></span>
<span class="line"><span style="color:#F07178;">	</span><span style="color:#A6ACCD;">语句</span><span style="color:#89DDFF;">...</span><span style="color:#F07178;">  </span></span>
<span class="line"><span style="color:#89DDFF;">}</span><span style="color:#A6ACCD;">	  </span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br></div></div><div class="language-js line-numbers-mode"><pre><code><span class="line"><span style="color:#A6ACCD;"> 执行流程  </span></span>
<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;font-style:italic;">if</span><span style="color:#89DDFF;">...</span><span style="color:#89DDFF;font-style:italic;">else</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;font-style:italic;">if</span><span style="color:#89DDFF;">...</span><span style="color:#A6ACCD;">else语句执行时，会自上至下依次对条件表达式进行求值判断，  </span></span>
<span class="line"><span style="color:#A6ACCD;">    如果判断结果为true，则执行当前if后的语句，执行完成后语句结束。  </span></span>
<span class="line"><span style="color:#A6ACCD;">    如果判断结果为false，则继续向下判断，直到找到为true的为止。  </span></span>
<span class="line"><span style="color:#A6ACCD;">    如果所有的条件表达式都是false，则执行else后的语句  </span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><ul><li>条件语句可以嵌套（最好不要嵌套超过三层）</li><li>if-elseif-else 语句注意条件的区间（下一级条件的成立是建立在上一级条件不成立的条件下）</li><li>可以只有 if 和 else if</li></ul><h2 id="_3-switch-条件分支语句" tabindex="-1">3.switch(条件分支语句) <a class="header-anchor" href="#_3-switch-条件分支语句" aria-hidden="true">#</a></h2><p>switch语句<br> 语法:</p><div class="language-javascript line-numbers-mode"><pre><code><span class="line"><span style="color:#89DDFF;font-style:italic;">switch</span><span style="color:#A6ACCD;"> (变量</span><span style="color:#89DDFF;">/</span><span style="color:#A6ACCD;">表达式) </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#A6ACCD;">    </span><span style="color:#89DDFF;font-style:italic;">case</span><span style="color:#A6ACCD;"> 常量值</span><span style="color:#89DDFF;">/</span><span style="color:#A6ACCD;">变量</span><span style="color:#89DDFF;">/</span><span style="color:#A6ACCD;">表达式</span><span style="color:#89DDFF;">:</span></span>
<span class="line"><span style="color:#A6ACCD;">        语句</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#A6ACCD;">        </span><span style="color:#89DDFF;font-style:italic;">break</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#A6ACCD;">    </span><span style="color:#89DDFF;font-style:italic;">case</span><span style="color:#A6ACCD;"> 常量值</span><span style="color:#89DDFF;">/</span><span style="color:#A6ACCD;">变量</span><span style="color:#89DDFF;">/</span><span style="color:#A6ACCD;">表达式</span><span style="color:#89DDFF;">:</span></span>
<span class="line"><span style="color:#A6ACCD;">        语句</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#A6ACCD;">        </span><span style="color:#89DDFF;font-style:italic;">break</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#A6ACCD;">    </span><span style="color:#89DDFF;font-style:italic;">default</span><span style="color:#89DDFF;">:</span></span>
<span class="line"><span style="color:#A6ACCD;">        语句</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#89DDFF;">}</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br></div></div><p>执行流程：<br> switch...case...语句在执行时，会依次将case后的表达式的值和switch后的表达式的值进行全等比较，<br> 如果比较结果为false，则继续向下比较。如果比较结果为true，则从当前case处开始向下执行代码。<br> 如果所有的case判断结果都为false，则从default处开始执行代码。</p><ul><li>与其他高级语言不同，在 JS 中 case 后不仅仅只能跟常量值，还可以跟变量和表达式</li><li>注意 switch 语句的 “开关” 特性（遇见 break 才跳出 switch，否则直接进入下一个 case），合理运用好 break（例如不加 break 可以实现多条 case 共用同一个语句体）</li><li>default 语句不是必须的</li></ul><h2 id="_4-while-循环语句" tabindex="-1">4.while 循环语句 <a class="header-anchor" href="#_4-while-循环语句" aria-hidden="true">#</a></h2><p>通过循环语句可以反复执行某些语句多次<br><strong>while循环</strong><br> 语法：</p><div class="language-javascript line-numbers-mode"><pre><code><span class="line"><span style="color:#89DDFF;font-style:italic;">while</span><span style="color:#A6ACCD;">(条件表达式)</span><span style="color:#89DDFF;">{</span><span style="color:#F07178;">  </span></span>
<span class="line"><span style="color:#F07178;">    </span><span style="color:#A6ACCD;">语句</span><span style="color:#89DDFF;">...</span><span style="color:#F07178;">  </span></span>
<span class="line"><span style="color:#89DDFF;">}</span><span style="color:#A6ACCD;">  </span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p>执行流程：<br> while语句在执行时，会先对条件表达式进行求值判断，<br> 如果判断结果为false，则终止循环<br> 如果判断结果为true，则执行循环体<br> 循环体执行完毕，继续对条件表达式进行求值判断，依此类推</p><p><strong>do...while循环</strong><br> 语法:</p><div class="language-javascript line-numbers-mode"><pre><code><span class="line"><span style="color:#89DDFF;font-style:italic;">do</span><span style="color:#89DDFF;">{</span><span style="color:#F07178;">  </span></span>
<span class="line"><span style="color:#A6ACCD;">语句</span><span style="color:#89DDFF;">...</span><span style="color:#F07178;">  </span></span>
<span class="line"><span style="color:#89DDFF;">}</span><span style="color:#89DDFF;font-style:italic;">while</span><span style="color:#A6ACCD;">(条件表达式)  </span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p>执行流程<br> do...while在执行时，会先执行do后的循环体，然后在对条件表达式进行判断，<br> 如果判断判断结果为false，则终止循环。<br> 如果判断结果为true，则继续执行循环体，依此类推</p><p>和while的区别：<br> while：先判断后执行<br> do...while: 先执行后判断<br> do...while可以确保循环体至少执行一次。</p><h2 id="_5-for-循环语句" tabindex="-1">5.for 循环语句 <a class="header-anchor" href="#_5-for-循环语句" aria-hidden="true">#</a></h2><p><strong>for循环</strong><br> 语法：</p><div class="language-javascript line-numbers-mode"><pre><code><span class="line"><span style="color:#89DDFF;font-style:italic;">for</span><span style="color:#A6ACCD;">(1初始化表达式 </span><span style="color:#89DDFF;">;</span><span style="color:#A6ACCD;"> 2条件表达式 </span><span style="color:#89DDFF;">;</span><span style="color:#A6ACCD;"> 4更新表达式)</span><span style="color:#89DDFF;">{</span><span style="color:#F07178;">  </span></span>
<span class="line"><span style="color:#F07178;">    3</span><span style="color:#A6ACCD;">语句</span><span style="color:#89DDFF;">...</span><span style="color:#F07178;">  </span></span>
<span class="line"><span style="color:#89DDFF;">}</span><span style="color:#A6ACCD;">  </span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p>执行流程：<br> 首先执行①初始化表达式，初始化一个变量，<br> 然后对②条件表达式进行求值判断，如果为false则终止循环<br> 如果判断结果为true，则执行③循环体<br> 循环体执行完毕，执行④更新表达式，对变量进行更新。<br> 更新表达式执行完毕重复②</p><p><strong>for in 循环</strong></p><p><code>for</code> 循环的一个变体是 <code>for ... in</code> 循环，它可以把一个对象的所有属性依次循环出来：</p><div class="language-javascript line-numbers-mode"><pre><code><span class="line"><span style="color:#C792EA;">var</span><span style="color:#A6ACCD;"> o </span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#A6ACCD;">    </span><span style="color:#F07178;">name</span><span style="color:#89DDFF;">:</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">&quot;</span><span style="color:#C3E88D;">Jerry</span><span style="color:#89DDFF;">&quot;</span><span style="color:#89DDFF;">,</span></span>
<span class="line"><span style="color:#A6ACCD;">    </span><span style="color:#F07178;">age</span><span style="color:#89DDFF;">:</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">20</span><span style="color:#89DDFF;">,</span></span>
<span class="line"><span style="color:#A6ACCD;">    </span><span style="color:#F07178;">city</span><span style="color:#89DDFF;">:</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">&quot;</span><span style="color:#C3E88D;">Beijing</span><span style="color:#89DDFF;">&quot;</span></span>
<span class="line"><span style="color:#89DDFF;">};</span></span>
<span class="line"></span>
<span class="line"><span style="color:#89DDFF;font-style:italic;">for</span><span style="color:#A6ACCD;"> (</span><span style="color:#C792EA;">var</span><span style="color:#A6ACCD;"> key </span><span style="color:#89DDFF;">in</span><span style="color:#A6ACCD;"> o) </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#F07178;">    </span><span style="color:#A6ACCD;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#F07178;">(</span><span style="color:#A6ACCD;">key</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">+</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">&quot;</span><span style="color:#C3E88D;">: </span><span style="color:#89DDFF;">&quot;</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">+</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">o</span><span style="color:#F07178;">[</span><span style="color:#A6ACCD;">key</span><span style="color:#F07178;">])</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#89DDFF;">}</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">/*</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">&quot;name: Jerry&quot;</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">&quot;age: 20&quot;</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">&quot;city: Beijing&quot;</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">*/</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br></div></div><p>要过滤掉对象继承的属性，用 <code>hasOwnProperty()</code> 来实现：</p><div class="language-javascript line-numbers-mode"><pre><code><span class="line"><span style="color:#C792EA;">var</span><span style="color:#A6ACCD;"> o </span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#A6ACCD;">    </span><span style="color:#F07178;">name</span><span style="color:#89DDFF;">:</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">&quot;</span><span style="color:#C3E88D;">Jerry</span><span style="color:#89DDFF;">&quot;</span><span style="color:#89DDFF;">,</span></span>
<span class="line"><span style="color:#A6ACCD;">    </span><span style="color:#F07178;">age</span><span style="color:#89DDFF;">:</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">20</span><span style="color:#89DDFF;">,</span></span>
<span class="line"><span style="color:#A6ACCD;">    </span><span style="color:#F07178;">city</span><span style="color:#89DDFF;">:</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">&quot;</span><span style="color:#C3E88D;">Beijing</span><span style="color:#89DDFF;">&quot;</span></span>
<span class="line"><span style="color:#89DDFF;">};</span></span>
<span class="line"></span>
<span class="line"><span style="color:#89DDFF;font-style:italic;">for</span><span style="color:#A6ACCD;"> (</span><span style="color:#C792EA;">var</span><span style="color:#A6ACCD;"> key </span><span style="color:#89DDFF;">in</span><span style="color:#A6ACCD;"> o) </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#F07178;">    </span><span style="color:#89DDFF;font-style:italic;">if</span><span style="color:#F07178;"> (</span><span style="color:#A6ACCD;">o</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">hasOwnProperty</span><span style="color:#F07178;">(</span><span style="color:#A6ACCD;">key</span><span style="color:#F07178;">)) </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#F07178;">        </span><span style="color:#A6ACCD;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#F07178;">(</span><span style="color:#A6ACCD;">key</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">+</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">&quot;</span><span style="color:#C3E88D;">: </span><span style="color:#89DDFF;">&quot;</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">+</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">o</span><span style="color:#F07178;">[</span><span style="color:#A6ACCD;">key</span><span style="color:#F07178;">])</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#F07178;">    </span><span style="color:#89DDFF;">}</span></span>
<span class="line"><span style="color:#89DDFF;">}</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">/*</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">&quot;name: Jerry&quot;</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">&quot;age: 20&quot;</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">&quot;city: Beijing&quot;</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">*/</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br></div></div><p>由于数组也是对象，而它的每个元素的索引被视为对象的属性，因此，<code>for ... in</code> 循环可以直接循环出数组的索引：</p><div class="language-javascript line-numbers-mode"><pre><code><span class="line"><span style="color:#C792EA;">var</span><span style="color:#A6ACCD;"> a </span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;"> [</span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">A</span><span style="color:#89DDFF;">&#39;</span><span style="color:#89DDFF;">,</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">B</span><span style="color:#89DDFF;">&#39;</span><span style="color:#89DDFF;">,</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">C</span><span style="color:#89DDFF;">&#39;</span><span style="color:#A6ACCD;">]</span><span style="color:#89DDFF;">;</span></span>
<span class="line"></span>
<span class="line"><span style="color:#89DDFF;font-style:italic;">for</span><span style="color:#A6ACCD;"> (</span><span style="color:#C792EA;">var</span><span style="color:#A6ACCD;"> i </span><span style="color:#89DDFF;">in</span><span style="color:#A6ACCD;"> a) </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#F07178;">    </span><span style="color:#A6ACCD;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#F07178;">(</span><span style="color:#A6ACCD;">i</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">+</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">&quot;</span><span style="color:#C3E88D;">: </span><span style="color:#89DDFF;">&quot;</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">+</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">a</span><span style="color:#F07178;">[</span><span style="color:#A6ACCD;">i</span><span style="color:#F07178;">])</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#89DDFF;">}</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">/*</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">0: A</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">1: B</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">2: C</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">*/</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br></div></div><p>请注意，<code>for ... in</code> 对数组的循环得到的索引是 <code>String</code> 而不是 <code>Number</code>。</p><p><strong>死循环</strong></p><div class="language-javascript line-numbers-mode"><pre><code><span class="line"><span style="color:#89DDFF;font-style:italic;">while</span><span style="color:#A6ACCD;">(</span><span style="color:#FF9CAC;">true</span><span style="color:#A6ACCD;">)</span><span style="color:#89DDFF;">{</span><span style="color:#F07178;">  </span></span>
<span class="line"></span>
<span class="line"><span style="color:#89DDFF;">}</span><span style="color:#A6ACCD;">  </span></span>
<span class="line"></span>
<span class="line"><span style="color:#89DDFF;font-style:italic;">for</span><span style="color:#A6ACCD;">(</span><span style="color:#89DDFF;">;;</span><span style="color:#A6ACCD;">)</span><span style="color:#89DDFF;">{</span><span style="color:#F07178;">  </span></span>
<span class="line"></span>
<span class="line"><span style="color:#89DDFF;">}</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div><h2 id="_6-break-和-continue" tabindex="-1">6.break 和 continue <a class="header-anchor" href="#_6-break-和-continue" aria-hidden="true">#</a></h2><p><code>break;</code>：立即终止本层次循环。</p><p><code>continue;</code>：立即跳过本层次循环，提前进入本层次的下一次循环。</p><h2 id="_7-label-表达式" tabindex="-1">7.label 表达式 <a class="header-anchor" href="#_7-label-表达式" aria-hidden="true">#</a></h2><p><code>label</code> 是一个标签，可以使用 <code>break</code> 或 <code>continue</code> 使程序跳转到这个标签处执行（执行：<code>break</code> 或 <code>continue</code>），从而改变程序的执行流程。</p><div class="language-javascript line-numbers-mode"><pre><code><span class="line"><span style="color:#676E95;font-style:italic;">// 注意：label 不是一个特定的关键字，可以随便取名</span></span>
<span class="line"><span style="color:#FFCB6B;">label</span><span style="color:#89DDFF;">:</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;font-style:italic;">for</span><span style="color:#A6ACCD;"> (</span><span style="color:#C792EA;">var</span><span style="color:#A6ACCD;"> i </span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">0</span><span style="color:#89DDFF;">;</span><span style="color:#A6ACCD;"> i </span><span style="color:#89DDFF;">&lt;</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">10</span><span style="color:#89DDFF;">;</span><span style="color:#A6ACCD;"> i</span><span style="color:#89DDFF;">++</span><span style="color:#A6ACCD;">) </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#F07178;">    </span><span style="color:#89DDFF;font-style:italic;">for</span><span style="color:#F07178;"> (</span><span style="color:#C792EA;">var</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">j</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">=</span><span style="color:#F07178;"> </span><span style="color:#F78C6C;">0</span><span style="color:#89DDFF;">;</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">j</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">&lt;</span><span style="color:#F07178;"> </span><span style="color:#F78C6C;">10</span><span style="color:#89DDFF;">;</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">j</span><span style="color:#89DDFF;">++</span><span style="color:#F07178;">) </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#F07178;">        </span><span style="color:#89DDFF;font-style:italic;">if</span><span style="color:#F07178;"> (</span><span style="color:#A6ACCD;">i</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">+</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">j</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">===</span><span style="color:#F07178;"> </span><span style="color:#F78C6C;">6</span><span style="color:#F07178;">) </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#F07178;">            </span><span style="color:#A6ACCD;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#F07178;">(</span><span style="color:#89DDFF;">&quot;</span><span style="color:#C3E88D;">j=</span><span style="color:#89DDFF;">&quot;</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">+</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">j</span><span style="color:#F07178;">)</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#F07178;">            </span><span style="color:#89DDFF;font-style:italic;">break</span><span style="color:#F07178;"> </span><span style="color:#FFCB6B;">label</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#F07178;">        </span><span style="color:#89DDFF;">}</span></span>
<span class="line"><span style="color:#F07178;">    </span><span style="color:#89DDFF;">}</span></span>
<span class="line"><span style="color:#F07178;">    </span><span style="color:#A6ACCD;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#F07178;">(</span><span style="color:#89DDFF;">&quot;</span><span style="color:#C3E88D;">i=</span><span style="color:#89DDFF;">&quot;</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">+</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">i</span><span style="color:#F07178;">)</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#89DDFF;">}</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">/*</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">j=6</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">*/</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br></div></div><div class="language-javascript line-numbers-mode"><pre><code><span class="line"><span style="color:#FFCB6B;">label</span><span style="color:#89DDFF;">:</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;font-style:italic;">for</span><span style="color:#A6ACCD;"> (</span><span style="color:#C792EA;">var</span><span style="color:#A6ACCD;"> i </span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">0</span><span style="color:#89DDFF;">;</span><span style="color:#A6ACCD;"> i </span><span style="color:#89DDFF;">&lt;</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">10</span><span style="color:#89DDFF;">;</span><span style="color:#A6ACCD;"> i</span><span style="color:#89DDFF;">++</span><span style="color:#A6ACCD;">) </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#F07178;">    </span><span style="color:#89DDFF;font-style:italic;">for</span><span style="color:#F07178;"> (</span><span style="color:#C792EA;">var</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">j</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">=</span><span style="color:#F07178;"> </span><span style="color:#F78C6C;">0</span><span style="color:#89DDFF;">;</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">j</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">&lt;</span><span style="color:#F07178;"> </span><span style="color:#F78C6C;">10</span><span style="color:#89DDFF;">;</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">j</span><span style="color:#89DDFF;">++</span><span style="color:#F07178;">) </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#F07178;">        </span><span style="color:#89DDFF;font-style:italic;">if</span><span style="color:#F07178;"> (</span><span style="color:#A6ACCD;">i</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">+</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">j</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">===</span><span style="color:#F07178;"> </span><span style="color:#F78C6C;">6</span><span style="color:#F07178;">) </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#F07178;">            </span><span style="color:#A6ACCD;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#F07178;">(</span><span style="color:#89DDFF;">&quot;</span><span style="color:#C3E88D;">j=</span><span style="color:#89DDFF;">&quot;</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">+</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">j</span><span style="color:#F07178;">)</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#F07178;">            </span><span style="color:#89DDFF;font-style:italic;">continue</span><span style="color:#F07178;"> </span><span style="color:#FFCB6B;">label</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#F07178;">        </span><span style="color:#89DDFF;">}</span></span>
<span class="line"><span style="color:#F07178;">    </span><span style="color:#89DDFF;">}</span></span>
<span class="line"><span style="color:#F07178;">    </span><span style="color:#A6ACCD;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#F07178;">(</span><span style="color:#89DDFF;">&quot;</span><span style="color:#C3E88D;">i=</span><span style="color:#89DDFF;">&quot;</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">+</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">i</span><span style="color:#F07178;">)</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#89DDFF;">}</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">/*</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">j=6</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">j=5</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">j=4</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">j=3</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">j=2</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">j=1</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">j=0</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">i=7</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">i=8</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">i=9</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">*/</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br></div></div><div class="language-javascript line-numbers-mode"><pre><code><span class="line"><span style="color:#676E95;font-style:italic;">// label + break 配合可以用在循环外</span></span>
<span class="line"><span style="color:#FFCB6B;">label</span><span style="color:#89DDFF;">:</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#F07178;">    </span><span style="color:#89DDFF;font-style:italic;">if</span><span style="color:#F07178;"> (</span><span style="color:#F78C6C;">1</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">&gt;</span><span style="color:#F07178;"> </span><span style="color:#F78C6C;">0</span><span style="color:#F07178;">) </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#F07178;">        </span><span style="color:#A6ACCD;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#F07178;">(</span><span style="color:#89DDFF;">&quot;</span><span style="color:#C3E88D;">1</span><span style="color:#89DDFF;">&quot;</span><span style="color:#F07178;">)</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#F07178;">        </span><span style="color:#89DDFF;font-style:italic;">break</span><span style="color:#F07178;"> </span><span style="color:#FFCB6B;">label</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#F07178;">    </span><span style="color:#89DDFF;">}</span></span>
<span class="line"><span style="color:#F07178;">    </span><span style="color:#A6ACCD;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#F07178;">(</span><span style="color:#89DDFF;">&quot;</span><span style="color:#C3E88D;">2</span><span style="color:#89DDFF;">&quot;</span><span style="color:#F07178;">)</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#89DDFF;">}</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">/*</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">1</span></span>
<span class="line"><span style="color:#676E95;font-style:italic;">*/</span></span>
<span class="line"></span></code></pre><div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br></div></div><h2 id="_8-初识算法" tabindex="-1">8.初识算法 <a class="header-anchor" href="#_8-初识算法" aria-hidden="true">#</a></h2><p>算法：解决方案的准确而完整的描述！</p><ul><li>输入</li><li>输出</li><li>有穷性</li><li>确定性</li><li>可行性</li></ul><blockquote><p>好的算法还要满足：可读性、健壮性！</p></blockquote></div></div><!----></main><!--[--><!--]--><footer class="VPContentDocFooter" data-v-4fe9b7bd data-v-7f892bef><a class="prev-link" href="/js/02.html" data-v-7f892bef><span class="desc" data-v-7f892bef><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="vt-link-icon" data-v-7f892bef><path d="M15,19c-0.3,0-0.5-0.1-0.7-0.3l-6-6c-0.4-0.4-0.4-1,0-1.4l6-6c0.4-0.4,1-0.4,1.4,0s0.4,1,0,1.4L10.4,12l5.3,5.3c0.4,0.4,0.4,1,0,1.4C15.5,18.9,15.3,19,15,19z"></path></svg> Previous</span><span class="title" data-v-7f892bef>02 【JS表达式与操作符】</span></a><a class="next-link" href="/js/04.html" data-v-7f892bef><span class="desc" data-v-7f892bef>Next <svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="vt-link-icon" data-v-7f892bef><path d="M9,19c-0.3,0-0.5-0.1-0.7-0.3c-0.4-0.4-0.4-1,0-1.4l5.3-5.3L8.3,6.7c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l6,6c0.4,0.4,0.4,1,0,1.4l-6,6C9.5,18.9,9.3,19,9,19z"></path></svg></span><span class="title" data-v-7f892bef>04 【对象】</span></a></footer></div></div></div></div><div class="visually-hidden" aria-live="polite" data-v-23306c50>03 【流程控制语句】 has loaded</div></div></div>
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